diff --git a/querydsl-core/src/main/java/com/mysema/query/support/GroupBy.java b/querydsl-core/src/main/java/com/mysema/query/support/GroupBy.java
index 79122ab63..4f1a467f4 100644
--- a/querydsl-core/src/main/java/com/mysema/query/support/GroupBy.java
+++ b/querydsl-core/src/main/java/com/mysema/query/support/GroupBy.java
@@ -114,6 +114,7 @@ public class GroupBy implements ResultTransformer<Collection<Group>> {
             }
         }
         
+        @Override
         public int size() {
             return values.size();
         }
diff --git a/querydsl-core/src/main/java/com/mysema/util/ClassPathUtils.java b/querydsl-core/src/main/java/com/mysema/util/ClassPathUtils.java
index f4b358c83..f35d24649 100644
--- a/querydsl-core/src/main/java/com/mysema/util/ClassPathUtils.java
+++ b/querydsl-core/src/main/java/com/mysema/util/ClassPathUtils.java
@@ -85,7 +85,11 @@ public final class ClassPathUtils {
     
     private static Class<?> safeClassForName(String className){
         try {
-            return Class.forName(className);
+            if (className.startsWith("com.sun")) {
+                return null;
+            } else {
+                return Class.forName(className);
+            }
         } catch (ClassNotFoundException e) {
             return null;
         } catch (NoClassDefFoundError e) {